The red underline can be removed by going to the
Tools menu, hovering over
Spelling, then unchecking
Show Vernacular Spelling Errors.
To get a particular element in the display of your entry to begin on a new line, enter \0A into the Before box of the appropriate node in the Configure Dictionary tool. Below is a screenshot of the FLEx Help topic that provides this information. To find the correct node for adding this to the Before box, in either the Dictionary view or the Preview pane of the Lexicon Edit view, right-click on the element that you want to have begin on a new line, then choose Configure Dictionary View... That will, in most cases, take you directly to the correct node for configuring. In certain cases, it will take you close to the one that you need to configure. If you need more help, just ask.
Best wishes,
Kevin Warfel